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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c | 604 |
1 files changed, 604 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c new file mode 100644 index 000000000..648ecf5a8 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c @@ -0,0 +1,604 @@ +/* + * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/* + * GK20A does not have dedicated video memory, and to accurately represent this + * fact Nouveau will not create a RAM device for it. Therefore its instmem + * implementation must be done directly on top of system memory, while + * preserving coherency for read and write operations. + * + * Instmem can be allocated through two means: + * 1) If an IOMMU unit has been probed, the IOMMU API is used to make memory + * pages contiguous to the GPU. This is the preferred way. + * 2) If no IOMMU unit is probed, the DMA API is used to allocate physically + * contiguous memory. + * + * In both cases CPU read and writes are performed by creating a write-combined + * mapping. The GPU L2 cache must thus be flushed/invalidated when required. To + * be conservative we do this every time we acquire or release an instobj, but + * ideally L2 management should be handled at a higher level. + * + * To improve performance, CPU mappings are not removed upon instobj release. + * Instead they are placed into a LRU list to be recycled when the mapped space + * goes beyond a certain threshold. At the moment this limit is 1MB. + */ +#include "priv.h" + +#include <core/memory.h> +#include <core/tegra.h> +#include <subdev/ltc.h> +#include <subdev/mmu.h> + +struct gk20a_instobj { + struct nvkm_memory memory; + struct nvkm_mm_node *mn; + struct gk20a_instmem *imem; + + /* CPU mapping */ + u32 *vaddr; +}; +#define gk20a_instobj(p) container_of((p), struct gk20a_instobj, memory) + +/* + * Used for objects allocated using the DMA API + */ +struct gk20a_instobj_dma { + struct gk20a_instobj base; + + dma_addr_t handle; + struct nvkm_mm_node r; +}; +#define gk20a_instobj_dma(p) \ + container_of(gk20a_instobj(p), struct gk20a_instobj_dma, base) + +/* + * Used for objects flattened using the IOMMU API + */ +struct gk20a_instobj_iommu { + struct gk20a_instobj base; + + /* to link into gk20a_instmem::vaddr_lru */ + struct list_head vaddr_node; + /* how many clients are using vaddr? */ + u32 use_cpt; + + /* will point to the higher half of pages */ + dma_addr_t *dma_addrs; + /* array of base.mem->size pages (+ dma_addr_ts) */ + struct page *pages[]; +}; +#define gk20a_instobj_iommu(p) \ + container_of(gk20a_instobj(p), struct gk20a_instobj_iommu, base) + +struct gk20a_instmem { + struct nvkm_instmem base; + + /* protects vaddr_* and gk20a_instobj::vaddr* */ + struct mutex lock; + + /* CPU mappings LRU */ + unsigned int vaddr_use; + unsigned int vaddr_max; + struct list_head vaddr_lru; + + /* Only used if IOMMU if present */ + struct mutex *mm_mutex; + struct nvkm_mm *mm; + struct iommu_domain *domain; + unsigned long iommu_pgshift; + u16 iommu_bit; + + /* Only used by DMA API */ + unsigned long attrs; +}; +#define gk20a_instmem(p) container_of((p), struct gk20a_instmem, base) + +static enum nvkm_memory_target +gk20a_instobj_target(struct nvkm_memory *memory) +{ + return NVKM_MEM_TARGET_NCOH; +} + +static u8 +gk20a_instobj_page(struct nvkm_memory *memory) +{ + return 12; +} + +static u64 +gk20a_instobj_addr(struct nvkm_memory *memory) +{ + return (u64)gk20a_instobj(memory)->mn->offset << 12; +} + +static u64 +gk20a_instobj_size(struct nvkm_memory *memory) +{ + return (u64)gk20a_instobj(memory)->mn->length << 12; +} + +/* + * Recycle the vaddr of obj. Must be called with gk20a_instmem::lock held. + */ +static void +gk20a_instobj_iommu_recycle_vaddr(struct gk20a_instobj_iommu *obj) +{ + struct gk20a_instmem *imem = obj->base.imem; + /* there should not be any user left... */ + WARN_ON(obj->use_cpt); + list_del(&obj->vaddr_node); + vunmap(obj->base.vaddr); + obj->base.vaddr = NULL; + imem->vaddr_use -= nvkm_memory_size(&obj->base.memory); + nvkm_debug(&imem->base.subdev, "vaddr used: %x/%x\n", imem->vaddr_use, + imem->vaddr_max); +} + +/* + * Must be called while holding gk20a_instmem::lock + */ +static void +gk20a_instmem_vaddr_gc(struct gk20a_instmem *imem, const u64 size) +{ + while (imem->vaddr_use + size > imem->vaddr_max) { + /* no candidate that can be unmapped, abort... */ + if (list_empty(&imem->vaddr_lru)) + break; + + gk20a_instobj_iommu_recycle_vaddr( + list_first_entry(&imem->vaddr_lru, + struct gk20a_instobj_iommu, vaddr_node)); + } +} + +static void __iomem * +gk20a_instobj_acquire_dma(struct nvkm_memory *memory) +{ + struct gk20a_instobj *node = gk20a_instobj(memory); + struct gk20a_instmem *imem = node->imem; + struct nvkm_ltc *ltc = imem->base.subdev.device->ltc; + + nvkm_ltc_flush(ltc); + + return node->vaddr; +} + +static void __iomem * +gk20a_instobj_acquire_iommu(struct nvkm_memory *memory) +{ + struct gk20a_instobj_iommu *node = gk20a_instobj_iommu(memory); + struct gk20a_instmem *imem = node->base.imem; + struct nvkm_ltc *ltc = imem->base.subdev.device->ltc; + const u64 size = nvkm_memory_size(memory); + + nvkm_ltc_flush(ltc); + + mutex_lock(&imem->lock); + + if (node->base.vaddr) { + if (!node->use_cpt) { + /* remove from LRU list since mapping in use again */ + list_del(&node->vaddr_node); + } + goto out; + } + + /* try to free some address space if we reached the limit */ + gk20a_instmem_vaddr_gc(imem, size); + + /* map the pages */ + node->base.vaddr = vmap(node->pages, size >> PAGE_SHIFT, VM_MAP, + pgprot_writecombine(PAGE_KERNEL)); + if (!node->base.vaddr) { + nvkm_error(&imem->base.subdev, "cannot map instobj - " + "this is not going to end well...\n"); + goto out; + } + + imem->vaddr_use += size; + nvkm_debug(&imem->base.subdev, "vaddr used: %x/%x\n", + imem->vaddr_use, imem->vaddr_max); + +out: + node->use_cpt++; + mutex_unlock(&imem->lock); + + return node->base.vaddr; +} + +static void +gk20a_instobj_release_dma(struct nvkm_memory *memory) +{ + struct gk20a_instobj *node = gk20a_instobj(memory); + struct gk20a_instmem *imem = node->imem; + struct nvkm_ltc *ltc = imem->base.subdev.device->ltc; + + /* in case we got a write-combined mapping */ + wmb(); + nvkm_ltc_invalidate(ltc); +} + +static void +gk20a_instobj_release_iommu(struct nvkm_memory *memory) +{ + struct gk20a_instobj_iommu *node = gk20a_instobj_iommu(memory); + struct gk20a_instmem *imem = node->base.imem; + struct nvkm_ltc *ltc = imem->base.subdev.device->ltc; + + mutex_lock(&imem->lock); + + /* we should at least have one user to release... */ + if (WARN_ON(node->use_cpt == 0)) + goto out; + + /* add unused objs to the LRU list to recycle their mapping */ + if (--node->use_cpt == 0) + list_add_tail(&node->vaddr_node, &imem->vaddr_lru); + +out: + mutex_unlock(&imem->lock); + + wmb(); + nvkm_ltc_invalidate(ltc); +} + +static u32 +gk20a_instobj_rd32(struct nvkm_memory *memory, u64 offset) +{ + struct gk20a_instobj *node = gk20a_instobj(memory); + + return node->vaddr[offset / 4]; +} + +static void +gk20a_instobj_wr32(struct nvkm_memory *memory, u64 offset, u32 data) +{ + struct gk20a_instobj *node = gk20a_instobj(memory); + + node->vaddr[offset / 4] = data; +} + +static int +gk20a_instobj_map(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm, + struct nvkm_vma *vma, void *argv, u32 argc) +{ + struct gk20a_instobj *node = gk20a_instobj(memory); + struct nvkm_vmm_map map = { + .memory = &node->memory, + .offset = offset, + .mem = node->mn, + }; + + return nvkm_vmm_map(vmm, vma, argv, argc, &map); +} + +static void * +gk20a_instobj_dtor_dma(struct nvkm_memory *memory) +{ + struct gk20a_instobj_dma *node = gk20a_instobj_dma(memory); + struct gk20a_instmem *imem = node->base.imem; + struct device *dev = imem->base.subdev.device->dev; + + if (unlikely(!node->base.vaddr)) + goto out; + + dma_free_attrs(dev, (u64)node->base.mn->length << PAGE_SHIFT, + node->base.vaddr, node->handle, imem->attrs); + +out: + return node; +} + +static void * +gk20a_instobj_dtor_iommu(struct nvkm_memory *memory) +{ + struct gk20a_instobj_iommu *node = gk20a_instobj_iommu(memory); + struct gk20a_instmem *imem = node->base.imem; + struct device *dev = imem->base.subdev.device->dev; + struct nvkm_mm_node *r = node->base.mn; + int i; + + if (unlikely(!r)) + goto out; + + mutex_lock(&imem->lock); + + /* vaddr has already been recycled */ + if (node->base.vaddr) + gk20a_instobj_iommu_recycle_vaddr(node); + + mutex_unlock(&imem->lock); + + /* clear IOMMU bit to unmap pages */ + r->offset &= ~BIT(imem->iommu_bit - imem->iommu_pgshift); + + /* Unmap pages from GPU address space and free them */ + for (i = 0; i < node->base.mn->length; i++) { + iommu_unmap(imem->domain, + (r->offset + i) << imem->iommu_pgshift, PAGE_SIZE); + dma_unmap_page(dev, node->dma_addrs[i], PAGE_SIZE, + DMA_BIDIRECTIONAL); + __free_page(node->pages[i]); + } + + /* Release area from GPU address space */ + mutex_lock(imem->mm_mutex); + nvkm_mm_free(imem->mm, &r); + mutex_unlock(imem->mm_mutex); + +out: + return node; +} + +static const struct nvkm_memory_func +gk20a_instobj_func_dma = { + .dtor = gk20a_instobj_dtor_dma, + .target = gk20a_instobj_target, + .page = gk20a_instobj_page, + .addr = gk20a_instobj_addr, + .size = gk20a_instobj_size, + .acquire = gk20a_instobj_acquire_dma, + .release = gk20a_instobj_release_dma, + .map = gk20a_instobj_map, +}; + +static const struct nvkm_memory_func +gk20a_instobj_func_iommu = { + .dtor = gk20a_instobj_dtor_iommu, + .target = gk20a_instobj_target, + .page = gk20a_instobj_page, + .addr = gk20a_instobj_addr, + .size = gk20a_instobj_size, + .acquire = gk20a_instobj_acquire_iommu, + .release = gk20a_instobj_release_iommu, + .map = gk20a_instobj_map, +}; + +static const struct nvkm_memory_ptrs +gk20a_instobj_ptrs = { + .rd32 = gk20a_instobj_rd32, + .wr32 = gk20a_instobj_wr32, +}; + +static int +gk20a_instobj_ctor_dma(struct gk20a_instmem *imem, u32 npages, u32 align, + struct gk20a_instobj **_node) +{ + struct gk20a_instobj_dma *node; + struct nvkm_subdev *subdev = &imem->base.subdev; + struct device *dev = subdev->device->dev; + + if (!(node = kzalloc(sizeof(*node), GFP_KERNEL))) + return -ENOMEM; + *_node = &node->base; + + nvkm_memory_ctor(&gk20a_instobj_func_dma, &node->base.memory); + node->base.memory.ptrs = &gk20a_instobj_ptrs; + + node->base.vaddr = dma_alloc_attrs(dev, npages << PAGE_SHIFT, + &node->handle, GFP_KERNEL, + imem->attrs); + if (!node->base.vaddr) { + nvkm_error(subdev, "cannot allocate DMA memory\n"); + return -ENOMEM; + } + + /* alignment check */ + if (unlikely(node->handle & (align - 1))) + nvkm_warn(subdev, + "memory not aligned as requested: %pad (0x%x)\n", + &node->handle, align); + + /* present memory for being mapped using small pages */ + node->r.type = 12; + node->r.offset = node->handle >> 12; + node->r.length = (npages << PAGE_SHIFT) >> 12; + + node->base.mn = &node->r; + return 0; +} + +static int +gk20a_instobj_ctor_iommu(struct gk20a_instmem *imem, u32 npages, u32 align, + struct gk20a_instobj **_node) +{ + struct gk20a_instobj_iommu *node; + struct nvkm_subdev *subdev = &imem->base.subdev; + struct device *dev = subdev->device->dev; + struct nvkm_mm_node *r; + int ret; + int i; + + /* + * despite their variable size, instmem allocations are small enough + * (< 1 page) to be handled by kzalloc + */ + if (!(node = kzalloc(sizeof(*node) + ((sizeof(node->pages[0]) + + sizeof(*node->dma_addrs)) * npages), GFP_KERNEL))) + return -ENOMEM; + *_node = &node->base; + node->dma_addrs = (void *)(node->pages + npages); + + nvkm_memory_ctor(&gk20a_instobj_func_iommu, &node->base.memory); + node->base.memory.ptrs = &gk20a_instobj_ptrs; + + /* Allocate backing memory */ + for (i = 0; i < npages; i++) { + struct page *p = alloc_page(GFP_KERNEL); + dma_addr_t dma_adr; + + if (p == NULL) { + ret = -ENOMEM; + goto free_pages; + } + node->pages[i] = p; + dma_adr = dma_map_page(dev, p, 0, PAGE_SIZE, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, dma_adr)) { + nvkm_error(subdev, "DMA mapping error!\n"); + ret = -ENOMEM; + goto free_pages; + } + node->dma_addrs[i] = dma_adr; + } + + mutex_lock(imem->mm_mutex); + /* Reserve area from GPU address space */ + ret = nvkm_mm_head(imem->mm, 0, 1, npages, npages, + align >> imem->iommu_pgshift, &r); + mutex_unlock(imem->mm_mutex); + if (ret) { + nvkm_error(subdev, "IOMMU space is full!\n"); + goto free_pages; + } + + /* Map into GPU address space */ + for (i = 0; i < npages; i++) { + u32 offset = (r->offset + i) << imem->iommu_pgshift; + + ret = iommu_map(imem->domain, offset, node->dma_addrs[i], + PAGE_SIZE, IOMMU_READ | IOMMU_WRITE); + if (ret < 0) { + nvkm_error(subdev, "IOMMU mapping failure: %d\n", ret); + + while (i-- > 0) { + offset -= PAGE_SIZE; + iommu_unmap(imem->domain, offset, PAGE_SIZE); + } + goto release_area; + } + } + + /* IOMMU bit tells that an address is to be resolved through the IOMMU */ + r->offset |= BIT(imem->iommu_bit - imem->iommu_pgshift); + + node->base.mn = r; + return 0; + +release_area: + mutex_lock(imem->mm_mutex); + nvkm_mm_free(imem->mm, &r); + mutex_unlock(imem->mm_mutex); + +free_pages: + for (i = 0; i < npages && node->pages[i] != NULL; i++) { + dma_addr_t dma_addr = node->dma_addrs[i]; + if (dma_addr) + dma_unmap_page(dev, dma_addr, PAGE_SIZE, + DMA_BIDIRECTIONAL); + __free_page(node->pages[i]); + } + + return ret; +} + +static int +gk20a_instobj_new(struct nvkm_instmem *base, u32 size, u32 align, bool zero, + struct nvkm_memory **pmemory) +{ + struct gk20a_instmem *imem = gk20a_instmem(base); + struct nvkm_subdev *subdev = &imem->base.subdev; + struct gk20a_instobj *node = NULL; + int ret; + + nvkm_debug(subdev, "%s (%s): size: %x align: %x\n", __func__, + imem->domain ? "IOMMU" : "DMA", size, align); + + /* Round size and align to page bounds */ + size = max(roundup(size, PAGE_SIZE), PAGE_SIZE); + align = max(roundup(align, PAGE_SIZE), PAGE_SIZE); + + if (imem->domain) + ret = gk20a_instobj_ctor_iommu(imem, size >> PAGE_SHIFT, + align, &node); + else + ret = gk20a_instobj_ctor_dma(imem, size >> PAGE_SHIFT, + align, &node); + *pmemory = node ? &node->memory : NULL; + if (ret) + return ret; + + node->imem = imem; + + nvkm_debug(subdev, "alloc size: 0x%x, align: 0x%x, gaddr: 0x%llx\n", + size, align, (u64)node->mn->offset << 12); + + return 0; +} + +static void * +gk20a_instmem_dtor(struct nvkm_instmem *base) +{ + struct gk20a_instmem *imem = gk20a_instmem(base); + + /* perform some sanity checks... */ + if (!list_empty(&imem->vaddr_lru)) + nvkm_warn(&base->subdev, "instobj LRU not empty!\n"); + + if (imem->vaddr_use != 0) + nvkm_warn(&base->subdev, "instobj vmap area not empty! " + "0x%x bytes still mapped\n", imem->vaddr_use); + + return imem; +} + +static const struct nvkm_instmem_func +gk20a_instmem = { + .dtor = gk20a_instmem_dtor, + .memory_new = gk20a_instobj_new, + .zero = false, +}; + +int +gk20a_instmem_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst, + struct nvkm_instmem **pimem) +{ + struct nvkm_device_tegra *tdev = device->func->tegra(device); + struct gk20a_instmem *imem; + + if (!(imem = kzalloc(sizeof(*imem), GFP_KERNEL))) + return -ENOMEM; + nvkm_instmem_ctor(&gk20a_instmem, device, type, inst, &imem->base); + mutex_init(&imem->lock); + *pimem = &imem->base; + + /* do not allow more than 1MB of CPU-mapped instmem */ + imem->vaddr_use = 0; + imem->vaddr_max = 0x100000; + INIT_LIST_HEAD(&imem->vaddr_lru); + + if (tdev->iommu.domain) { + imem->mm_mutex = &tdev->iommu.mutex; + imem->mm = &tdev->iommu.mm; + imem->domain = tdev->iommu.domain; + imem->iommu_pgshift = tdev->iommu.pgshift; + imem->iommu_bit = tdev->func->iommu_bit; + + nvkm_info(&imem->base.subdev, "using IOMMU\n"); + } else { + imem->attrs = DMA_ATTR_WEAK_ORDERING | + DMA_ATTR_WRITE_COMBINE; + + nvkm_info(&imem->base.subdev, "using DMA API\n"); + } + + return 0; +} |